接地网垂直接地极地表传导电流分析
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摘要
垂直接地极作为一种有效降低接地网接地电阻的方法,在接地网图纸缺失或图纸与实际不符情况下,面临准确探测位置等问题。根据安培环路定律,提出通过测量地表传导电流来探测接地网垂直接地极位置的方法。通过理论公式推导,推算垂直接地极及其连接地网支路在地表产生的传导电流分布情况;再构建有/无垂直接地极的接地网模型,仿真垂直接地极对地表传导电流的影响。理论分析和模型仿真验证表明,测量地表传导电流能够有效地探测垂直接地极位置,方法简单,可进一步用于接地网3D结构成像。
The vertical grounding electrode is an effective method to reduce grounding resistance.When grounding system drawings are missing or incorrect,it is important to detect vertical grounding electrode position accurately.According to ampere 's law,a method is proposed to locate vertical grounding electrode position by measuring conduction current of ground surface.Firstly,the conduction current distribution of vertical grounding grid and its connection branch is generated through the theoretical formula.Secondly,grounding grid model is constructed with and without vertical grounding electrode to simulate effect of vertical grounding electrodes on conduction current.Theoretical analysis and simulation model both indicate that vertical grounding electrode can be located effectively by measuring conduction current of ground surface.The detection method is simple,and can be used in further 3D imaging of grounded system structure.
The vertical grounding electrode is an effective method to reduce grounding resistance.When grounding system drawings are missing or incorrect,it is important to detect vertical grounding electrode position accurately.According to ampere 's law,a method is proposed to locate vertical grounding electrode position by measuring conduction current of ground surface.Firstly,the conduction current distribution of vertical grounding grid and its connection branch is generated through the theoretical formula.Secondly,grounding grid model is constructed with and without vertical grounding electrode to simulate effect of vertical grounding electrodes on conduction current.Theoretical analysis and simulation model both indicate that vertical grounding electrode can be located effectively by measuring conduction current of ground surface.The detection method is simple,and can be used in further 3D imaging of grounded system structure.
引文
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[9]王飞鸣,林莘,徐建源.特高压气体绝缘开关设备接地系统环流计算与分析[J].电网技术,2012,36(7):33-37.WANG Feiming,LIN Xin,XU Jianyuan.Calculation and analysis on circulating current in grounding system of UHV hybrid gas insulated switchgears[J].Power System Technology,2012,36(7):33-37.
[10]张波,何金良,曾嵘.电力系统接地技术现状及展望[J].高电压技术,2015,41(8):2569-2582.ZHANG Bo,HE Jinliang,ZENG Rong.State of art and prospect of grounding technology in power system[J].High Voltage Engineering,2015,41(8):2569-2582.
[11]刘洋,江明亮,崔翔.变电站接地网导体与网格结构探测方法[J].电工技术学报,2013,28(5):167-173.LIU Yang,JIANG Mingliang,CUI Xiang.Detecting method of conductors and mesh structure of substation’s grounding grids[J].Transactions of China Electrotechnical Society,2013,28(5):167-173.
[12]王晓宇,何为,杨帆,等.基于微分法的接地网拓扑结构检测[J].电工技术学报,2015,30(3):73-78,89.WANG Xiaoyu,HE Wei,YANG Fan,et al.Topology detection of grounding grids based on derivative method[J].Transactions of China Electrotechnical Society,2015,30(3):73-78,89.
[13]ZHANG Bo,ZHAO Zhibin,CUI Xiang.Diagnosis of breaks in substation’s grounding grid by using electro-magnetic method[J].IEEE Transactions on Magnetics,2002,38(2):473-476.
[14]刘洋,崔翔,赵志斌,等.变电站接地网腐蚀诊断磁场检测系统的设计与应用[J].电工技术学报,2009,24(1):176-182.LIU Yang,CUI Xiang,ZHAO Zhibin,et al.Design and application of testing magnetic field system for corrosion diagnosis of grounding grids in substation[J].Transactions of China Electrotechnical Society,2009,24(1):176-182.
[15]张婷,张小亮.接地网网内压降的仿真分析[J].中国电力,2014,47(3):111-115.ZHANG Ting,ZHANG Xiaoliang.Simulation of inner-potential difference of grounding grid[J].Electric Power,2014,47(3):111-115.
[2]余晓东.高土壤电阻率地区变电站接地设计与降阻技术研究[D].重庆:重庆大学,2009.
[3]许非吾,张亮,刘义华,等.500 k V兰亭变电所接地网降阻改造[J].高电压技术,2008,34(4):839-841.XU Feiwu,ZHANG Liang,LIU Yihua,et al.Reducing resistance of grounding grid in 500 k V Lanting substation[J].High Voltage Engineering,2008,34(4):839-841.
[4]庄池杰,曾嵘,张波,等.高土壤电阻率地区变电站接地网设计思路[J].高电压技术,2008,34(5):893-897.ZHUANG Chijie,ZENG Rong,ZHANG Bo,et al.Grounding system design method in high soil resistivity regions[J].High Voltage Engineering,2008,34(5):893-897.
[5]单业才,咸日常,安建强,等.长垂直接地极改善接地网电气性能的作用[J].高电压技术,2000,26(1):51-53.SHAN Yecai,XIAN Richang,AN Jianqiang,et al.Effects of long vertical grounding electrodes on improving electrical property of grounding grid[J].High Voltage Engineering,2000,26(1):51-53.
[6]IEEE guide for safety in AC substation grounding:IEEE Std 80-2000[S].2000.
[7]王羽,李晓萍,罗思敏,等.垂直型直流接地极暂态温升计算与试验[J].中国电机工程学报,2013,33(10):184-190,2.WANG Yu,LI Xiaoping,LUO Simin,et al.Test and computation for vertical ground electrode’s transient temperature rise[J].Proceedings of the CSEE,2013,33(10):184-190,2.
[8]王建武,杜忠东,李家源,等.UHVDC垂直接地极技术经济性能分析[J].高电压技术,2006,32(9):59-61.WANG Jianwu,DU Zhongdong,LI Jiayuan,et al.Drounding performance study and economic comparison on vertical grounding electrodes of UHVDC[J].High Voltage Engineering,2006,32(9):59-61.
[9]王飞鸣,林莘,徐建源.特高压气体绝缘开关设备接地系统环流计算与分析[J].电网技术,2012,36(7):33-37.WANG Feiming,LIN Xin,XU Jianyuan.Calculation and analysis on circulating current in grounding system of UHV hybrid gas insulated switchgears[J].Power System Technology,2012,36(7):33-37.
[10]张波,何金良,曾嵘.电力系统接地技术现状及展望[J].高电压技术,2015,41(8):2569-2582.ZHANG Bo,HE Jinliang,ZENG Rong.State of art and prospect of grounding technology in power system[J].High Voltage Engineering,2015,41(8):2569-2582.
[11]刘洋,江明亮,崔翔.变电站接地网导体与网格结构探测方法[J].电工技术学报,2013,28(5):167-173.LIU Yang,JIANG Mingliang,CUI Xiang.Detecting method of conductors and mesh structure of substation’s grounding grids[J].Transactions of China Electrotechnical Society,2013,28(5):167-173.
[12]王晓宇,何为,杨帆,等.基于微分法的接地网拓扑结构检测[J].电工技术学报,2015,30(3):73-78,89.WANG Xiaoyu,HE Wei,YANG Fan,et al.Topology detection of grounding grids based on derivative method[J].Transactions of China Electrotechnical Society,2015,30(3):73-78,89.
[13]ZHANG Bo,ZHAO Zhibin,CUI Xiang.Diagnosis of breaks in substation’s grounding grid by using electro-magnetic method[J].IEEE Transactions on Magnetics,2002,38(2):473-476.
[14]刘洋,崔翔,赵志斌,等.变电站接地网腐蚀诊断磁场检测系统的设计与应用[J].电工技术学报,2009,24(1):176-182.LIU Yang,CUI Xiang,ZHAO Zhibin,et al.Design and application of testing magnetic field system for corrosion diagnosis of grounding grids in substation[J].Transactions of China Electrotechnical Society,2009,24(1):176-182.
[15]张婷,张小亮.接地网网内压降的仿真分析[J].中国电力,2014,47(3):111-115.ZHANG Ting,ZHANG Xiaoliang.Simulation of inner-potential difference of grounding grid[J].Electric Power,2014,47(3):111-115.